scholarly journals MODELLING NET PHOTOSYNTHETIC RATE OF TEMPERATE DRY GRASSLAND SPECIES AND WINTER WHEAT AT ELEVATED AIR CO2 CONCENTRATION

2006 ◽  
Vol 4 (2) ◽  
pp. 47-53 ◽  
Author(s):  
N Harnos
Keyword(s):  
Winter Wheat ◽  
Net Photosynthetic Rate ◽  
Photosynthetic Rate ◽  
Co2 Concentration ◽  
Dry Grassland ◽  
Grassland Species

scholarly journals Effects of Potassium Silicate Fertilizer on Photosynthetic Characteristics and Yield in Winter Wheat (Triticum Aestivum L.)

2021 ◽  
Vol 50 (4) ◽  
pp. 1127-1132
Author(s):  
Wubo Li ◽  
Meng Li ◽  
Yunshuo Xu ◽  
Yan Shi
Keyword(s):  
Triticum Aestivum ◽  
Winter Wheat ◽  
Net Photosynthetic Rate ◽  
Photosynthetic Rate ◽  
Flag Leaf ◽  
Triticum Aestivum L ◽  
Photosynthetic Characteristics ◽  
Potassium Silicate ◽  
Existence Time ◽  
1000 Grain Weight

Effects of different dosages of potassium silicate fertilizer on photosynthetic characteristics and yield of winter wheat under field conditions were studied. Four different dosages: 0, 45, 90 and 135kg/ha were applied. Results showed that the chlorophyll content, net photosynthetic rate of wheat flag leaf firstly increased and then decreased with the increase of levels of potassium silicate fertilizer. By the change of SPAD values after flowering, when the application of potassium silicate fertilizer was 90 kg/ha, the existence time of chlorophyll in flag leaf was significantly long, and the net photosynthetic rate was significantly increased. The 1000-grain weight of winter wheat significantly increased and the yield the highest. Overall, when the applied amount of potassium silicate fertilizer was 90 kg/ha, the performances of winter wheat were best. Bangladesh J. Bot. 50(4): 1127-1132, 2021 (December)

scholarly journals Photosynthetic Product Allocations to the Organs of Pinus massoniana Are Not Affected by Differences in Synthesis or Temporal Variations in Translocation Rates

Forests ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 471
Author(s):  
Xiuxiu Deng ◽  
Zheng Shi ◽  
Lixiong Zeng ◽  
Lei Lei ◽  
Xuebing Xin ◽  
...  
Keyword(s):  
Net Photosynthetic Rate ◽  
Photosynthetic Rate ◽  
Co2 Concentration ◽  
Pinus Massoniana ◽  
Temporal Variations ◽  
Mean Value ◽  
Diurnal Changes ◽  
13C Pulse Labeling ◽  
Pinus Massoniana Lamb ◽  
Photosynthetic Products

Photosynthesis and the allocation of photosynthetic products are the two main factors that determine plant growth. To understand the growth and productivity of Pinus massoniana Lamb., the diurnal changes in photosynthetic rate were continuously monitored. Furthermore, the translocation and allocation of the photosynthetic products synthesized in the morning and afternoon were explored using 13C pulse labeling. The results showed that: (1) on sunny days, the diurnal variation of the net photosynthetic rate showed a “double peak” curve, with an obvious “a depression” when temperatures were highest and humidity lowest. On cloudy days, it showed an irregular “jagged” curve, which was curve consistent with the variations in photosynthetically active radiation (PAR). Meanwhile, the photosynthetic rate changed with the transient changes in environmental factors such as PAR, temperature, and humidity. (2) The mean value of the net photosynthetic rate in the morning was higher than in the afternoon, and the response of the net photosynthetic rate to environmental change (PAR, temperature, humidity, and CO2 concentration) in the morning was greater than that in the afternoon. (3) The translocation of photosynthetic products synthesized in the afternoon was faster than that in the morning. Shortly after synthesis of photosynthetic products, the translocation of products synthesized in the morning tended toward upper organs (including current-year leaves and 1-year leaves), while the translocation of products synthesized in the afternoon decreased in the upper organs. However, after 15 days of 13C pulse labeling, the allocation of the photosynthetic products synthesized in the morning and afternoon tended to be the same. These results indicate that the differences in the photosynthetic products synthesized and the temporal differences in the translocation rates did not affect the final allocation of the photosynthetic products in the various organs of the P. massoniana. These results improve our knowledge of the functional phases of P. massoniana during the diurnal cycle.

scholarly journals Simulation of the Time Courses of CO2 Concentration in the Culture Vessel and Net Photosynthetic Rates of Potato Plantlets Cultured Photoautotrophically and Photomixotrophically in Vitro under Different Lighting Cycles

HortScience ◽  
1997 ◽  
Vol 32 (3) ◽  
pp. 515F-515
Author(s):  
Genhua Niu ◽  
Makio Hayashi ◽  
Toyoki Kozai
Keyword(s):  
Net Photosynthetic Rate ◽  
Photosynthetic Rate ◽  
Quantitative Relationship ◽  
Dry Weight ◽  
Co2 Concentration ◽  
Ventilation Rate ◽  
Culture Vessel ◽  
Time Courses ◽  
Potato Plantlets

Potato (Solanum tuberosum L. cv. Benimaru) plantlets were cultured under four lighting cycles (photoperiod/dark period: 16 h/8 h, 4 h/2 h, 1 h/0.5 h, and 0.25 h/0.125 h) photoautotrophically (without sugar in the medium), and photomixotrophically (with sugar in the medium) in vitro for 28 days. Simulations of time courses of CO2 concentration in the vessel (Ci) and dry weight accumulation of the plantlets cultured photoautotrophically were conducted using a previously developed model (Niu and Kozai, 1997). While underestimation and overestimation of time courses of Ci in some treatments were observed, the simulated results of Ci and dry weight accumulation of the plantlets generally agreed with the measured ones. The difference of net photosynthetic rate response to Ci throughout the culture period was examined between the plantlets cultured photoautotrophically and photomixotrophically. Quantitative relationship between daily net photosynthetic rate (daily net production) and vessel ventilation rate per plantlet was simulated under various CO2 levels outside the vessel for given sizes of potato plantlets cultured photoautotrophically in vitro to aid appropriate CO2 enrichment and vessel design in commercial micropropagation.

Analysis on Photosynthetic Characteristics and Carbon Sequestration Potential of Lespedeza bicolor of SP1 Generation

2012 ◽  
Vol 518-523 ◽  
pp. 4985-4993
Author(s):  
Si Jia Liu ◽  
Zhi Tong Zhao ◽  
Xiao Dan Yu ◽  
Hong Chao Li ◽  
Yun Wei Zhang
Keyword(s):  
Carbon Sequestration ◽  
Microbial Biomass ◽  
Net Photosynthetic Rate ◽  
Root System ◽  
Photosynthetic Rate ◽  
Co2 Concentration ◽  
Atmospheric Co2 ◽  
Carbon Sequestration Potential ◽  
Sequestration Potential ◽  
Lespedeza Bicolor

Lespedeza bicolor has developed root system and the ability of carbon sequestration, which can effectively improve the soil nutrient. We measured the correlation of net photosynthetic rate and physiological and environmental factors using space mutated Lespedeza bicolor of SP1 generation, the change of soil carbon and nitrogen content and microbial biomass was also discussed. The conclusion showed that the diurnal variation of photosynthesis was registered as double－peak curve and had "noon break" phenomenon. It showed strong ability of photosynthesis and its mean diurnal photosynthetic rates was 8.77 umolCO2·m-2s-1. Highly correlation was existed between net photosynthetic rate and atmospheric CO2 concentration ,the content of soil organic carbon and total nitrogen and soil microbial biomass displayed negatively relationship to the depth of the soil. Base on the study , we can conclude that the photosynthetic organic matter was effectively accumulated by Lespedeza bicolor of SP1 generation which made use of atmospheric CO2 and the root system located in the superficial soil has better potential of carbon sequestration.

Effects of Low Temperature and Light Stress on Gas Exchange and Chlorophyll Fluorescence of Pumpkin Seedlings

2012 ◽  
Vol 450-451 ◽  
pp. 537-542
Author(s):  
En Xiang Kang ◽  
Jun Jie Luo ◽  
Hui Zhen Qiu ◽  
Nian Lai Chen ◽  
Dan Su ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Low Temperature ◽  
Net Photosynthetic Rate ◽  
Photosynthetic Rate ◽  
Evaporation Rate ◽  
Light Stress ◽  
Intercellular Co2 Concentration ◽  
Co2 Concentration ◽  
Photochemical Quenching ◽  
Intercellular Co2

Pumpkin（Cucubita pepo L.）seedlings were exposed under different low temperature-light regimes to investigate the responses of photosynthesis and chlorophyll fluorescence to the stress. The results indicated that the contents of chlorophyll increased at first day after treatment and then decreased under special temperature(15/5、20/10、25/15°C )and poor light(50、150、250μmol•m-2•s-1).The net photosynthetic rate, evaporation rate, stomata conductance and intercellular CO2 concentration increased one day after treatment and then decreased, stomata limitation increased above15/5°C special temperature and special poor light. However, under 15/5°C temperature and special poor light, the net photosynthetic rate, evaporation rate and stomata conductance decreased, and intercellular CO2 concentration increased stomata limitation increased in 4 days after treatment then decreased. Ft、Yield(F/Fm’)、qP decreased under special temperature and poor light.The change of these parameters were less under the light density of 50μmol•m-2•s-2 than other light densities, which means that poorer light reduced the sensitivity of pumpkin to low temperature and increased the photochemical activity of PS, but the photochemical quenching (qP) decreased and the non-photochemical quenching(qN) increased at the same time.

Photosynthetic Characteristics for Mongolian Scots Pine Plantation and its Relation with Environmental Factors

2011 ◽  
Vol 393-395 ◽  
pp. 1334-1340 ◽  
Author(s):  
Jie Zhang ◽  
Zhao Gang Liu
Keyword(s):  
Environmental Factors ◽  
Net Photosynthetic Rate ◽  
Scots Pine ◽  
Photosynthetic Rate ◽  
Intercellular Co2 Concentration ◽  
Light Response ◽  
Co2 Concentration ◽  
Dynamic Responses ◽  
Diurnal Changes ◽  
Long Time

The needles' light dynamic response for net photosynthetic rate (Pn), the diurnal changes of net photosynthetic rates of annual Mongolian Scots pine and the relationship between of its Pn and environmental factors were studied in this paper by using LI-6400 portable photosynthesis system. Results show that needles at different positions of the crown have different light response for their net photosynthetic rate. Pn, photosynthetic saturated light intensity (PSLI) and light compensation point (LCP) of needles decreased from upper-crown through mid-crown to lower-crown. It suggests that different light dynamic responses of needles at different positions be related to micro-light environment to which needles acclimated in a long time. Diurnal variation of Pn showed a single peak. It had significantly positive correlation with stomatal conduction (Cond), transpiration rate (Tr) (at 0.01 level) and photosynthetically active radiation (PAR) (at 0.05 level), and significantly negative correlation with the intercellular CO2 concentration (Ci) (at 0.05 level).

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